Impacts of ocean warming on fish size reductions on the world's hottest coral reefs.

Autor: Johansen JL; Hawaii Institute of Marine Biology, University of Hawaii at Manoa, Honolulu, HI, USA. jacoblj@hawaii.edu.; Marine Biology Laboratory, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates. jacoblj@hawaii.edu., Mitchell MD; Marine Biology Laboratory, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates., Vaughan GO; Marine Biology Laboratory, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.; BiOrbic, Bioeconomy SFI Research Centre, O'Brien Centre for Science, University College Dublin, Dublin, Ireland., Ripley DM; Marine Biology Laboratory, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.; Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom., Shiels HA; Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom., Burt JA; Marine Biology Laboratory, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.; Mubadala ACCESS Center, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Jul 01; Vol. 15 (1), pp. 5457. Date of Electronic Publication: 2024 Jul 01.
DOI: 10.1038/s41467-024-49459-8
Abstrakt: The impact of ocean warming on fish and fisheries is vigorously debated. Leading theories project limited adaptive capacity of tropical fishes and 14-39% size reductions by 2050 due to mass-scaling limitations of oxygen supply in larger individuals. Using the world's hottest coral reefs in the Persian/Arabian Gulf as a natural laboratory for ocean warming - where species have survived >35.0 °C summer temperatures for over 6000 years and are 14-40% smaller at maximum size compared to cooler locations - we identified two adaptive pathways that enhance survival at elevated temperatures across 10 metabolic and swimming performance metrics. Comparing Lutjanus ehrenbergii and Scolopsis ghanam from reefs both inside and outside the Persian/Arabian Gulf across temperatures of 27.0 °C, 31.5 °C and 35.5 °C, we reveal that these species show a lower-than-expected rise in basal metabolic demands and a right-shifted thermal window, which aids in maintaining oxygen supply and aerobic performance to 35.5 °C. Importantly, our findings challenge traditional oxygen-limitation theories, suggesting a mismatch in energy acquisition and demand as the primary driver of size reductions. Our data support a modified resource-acquisition theory to explain how ocean warming leads to species-specific size reductions and why smaller individuals are evolutionarily favored under elevated temperatures.
(© 2024. The Author(s).)
Databáze: MEDLINE
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